Balance Sheet Effect of Derivative Financial Instruments [Abstract]

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Fair value of hedged debt carried at cost which approximates fair value

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Income Effect of Derivative Financial Instruments [Abstract]

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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
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Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

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Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset, deducted from derivative assets.

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The net gain (loss) included in earnings for the period relating to components of the gain (loss) on interest rate fair value hedging instruments excluded from the assessment of fair value hedge effectiveness.

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Derivative Financial Instruments and Hedging Activities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Derivative [Line Items]
Debt Carrying Value Fair Value	$ 39,400		$ 39,400		$ 38,000
Income Effect of Derivative Financial Instruments [Abstract]
Derivative, Gain (Loss) on Derivative, Net	177	$ (45)	(24)	$ (116)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	101,435		101,435		109,446
Fair Value of Derivative Assets	1,186		1,186		670
Fair Value of Derivative Liabilities	477		477		663
Derivative, Collateral, Obligation to Return Cash	24		24		19
Derivative, Collateral, Right to Reclaim Cash	85		85		59
Derivative Asset, Not Offset, Policy Election Deduction	190		190		233
Interest Rate Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Derivative, Gain (Loss) on Derivative, Net	(3)	(20)	(30)	(37)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	63,877		63,877		76,904
Interest Rate Contract [Member] \| Fair Value Hedging [Member] \| Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Net interest settlements and accruals excluded from the assessment of hedge effectiveness	(12)	(2)	(32)	24
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	474	(90)	724	(429)
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(463)	82	(716)	411
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	25,308		25,308		22,989
Foreign Exchange Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Derivative, Gain (Loss) on Derivative, Net	40	110	34	98
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	4,371		4,371		4,318
Cross Currency Interest Rate Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Derivative, Gain (Loss) on Derivative, Net	141	$ (125)	(4)	$ (183)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	7,879		7,879		5,235
Level 2 [Member] \| Fair Value, Measurements, Recurring [Member] \| Interest Rate Contract [Member] \| Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Fair Value of Derivative Assets	255		255		235
Fair Value of Derivative Liabilities	270		270		274
Level 2 [Member] \| Fair Value, Measurements, Recurring [Member] \| Interest Rate Contract [Member] \| Fair Value Hedging [Member] \| Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Fair Value of Derivative Assets	687		687		158
Fair Value of Derivative Liabilities	13		13		208
Level 2 [Member] \| Fair Value, Measurements, Recurring [Member] \| Foreign Exchange Contract [Member] \| Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Fair Value of Derivative Assets	16		16		45
Fair Value of Derivative Liabilities	31		31		24
Level 2 [Member] \| Fair Value, Measurements, Recurring [Member] \| Cross Currency Interest Rate Contract [Member] \| Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Fair Value of Derivative Assets	228		228		232
Fair Value of Derivative Liabilities	$ 163		$ 163		$ 157